dm: treewide: Rename 'platdata' variables to just 'plat'

We use 'priv' for private data but often use 'platdata' for platform data.
We can't really use 'pdata' since that is ambiguous (it could mean private
or platform data).

Rename some of the latter variables to end with 'plat' for consistency.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c
index 1beaea7..dc277aa 100644
--- a/drivers/spi/omap3_spi.c
+++ b/drivers/spi/omap3_spi.c
@@ -378,7 +378,7 @@
 {
 	struct udevice *bus = dev->parent;
 	struct omap3_spi_priv *priv = dev_get_priv(bus);
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
 
 	priv->cs = slave_plat->cs;
 	priv->freq = slave_plat->max_hz;
@@ -402,7 +402,7 @@
 {
 	struct udevice *bus = dev->parent;
 	struct omap3_spi_priv *priv = dev_get_priv(bus);
-	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+	struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
 
 	priv->cs = slave_plat->cs;
 	priv->wordlen = wordlen;
@@ -507,7 +507,7 @@
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 	.of_match = omap3_spi_ids,
 	.ofdata_to_platdata = omap3_spi_ofdata_to_platdata,
-	.platdata_auto	= sizeof(struct omap3_spi_plat),
+	.plat_auto	= sizeof(struct omap3_spi_plat),
 #endif
 	.probe = omap3_spi_probe,
 	.ops    = &omap3_spi_ops,